Bioactive pterocarpans from the root of Astragalus membranaceus var. mongholicus.

Eleven undescribed and three known pterocarpans were isolated and identified from the traditional Chinese medicine "Huang-qi", Astragali Radix (the root of Astragalus membranaceus var. mongholicus (Bunge) P.K.

Cycloartane-type triterpenoids from the root of var. .

Three new (-) and 11 known (-) cycloartane-type triterpenoids were isolated from the root of var. . Their structures were determined by spectroscopic analyses and chemical methods.